ebitenutil

Documentation

Overview

Package ebitenutil provides utility functions for Ebiten.

Index

• func DebugPrint(image *ebiten.Image, str string) error
• func DebugPrintAt(image *ebiten.Image, str string, x, y int)
• func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color)
• func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color)
• func NewImageFromFile(path string, filter ebiten.Filter) (*ebiten.Image, image.Image, error)
• func NewImageFromURL(url string) (*ebiten.Image, error)
• func RecordScreenAsGIF(update func(*ebiten.Image) error, out io.Writer, frameNum int) func(*ebiten.Image) error
• type ReadSeekCloser
  • func OpenFile(path string) (ReadSeekCloser, error)

Functions

func DebugPrint

func DebugPrint(image *ebiten.Image, str string) error

DebugPrint draws the string str on the image on left top corner.

The available runes are in U+0000 to U+00FF, which is C0 Controls and Basic Latin and C1 Controls and Latin-1 Supplement.

DebugPrint always returns nil as of 1.5.0-alpha.

func DebugPrintAt

func DebugPrintAt(image *ebiten.Image, str string, x, y int)

DebugPrintAt draws the string str on the image at (x, y) position.

The available runes are in U+0000 to U+00FF, which is C0 Controls and Basic Latin and C1 Controls and Latin-1 Supplement.

func DrawLine

func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color)

DrawLine draws a line segment on the given destination dst.

DrawLine is intended to be used mainly for debugging or prototyping purpose.

func DrawRect

func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color)

DrawRect draws a rectangle on the given destination dst.

DrawRect is intended to be used mainly for debugging or prototyping purpose.

func NewImageFromFile

func NewImageFromFile(path string, filter ebiten.Filter) (*ebiten.Image, image.Image, error)

NewImageFromFile loads the file with path and returns ebiten.Image and image.Image.

Image decoders must be imported when using NewImageFromFile. For example, if you want to load a PNG image, you'd need to add `_ "image/png"` to the import section.

How to solve path depends on your environment. This varies on your desktop or web browser. Note that this doesn't work on mobiles.

For productions, instead of using NewImageFromFile, it is safer to embed your resources, e.g., with github.com/rakyll/statik .

func NewImageFromURL

func NewImageFromURL(url string) (*ebiten.Image, error)

NewImageFromURL creates a new ebiten.Image from the given URL.

Image decoders must be imported when using NewImageFromURL. For example, if you want to load a PNG image, you'd need to add `_ "image/png"` to the import section.

FilterDefault is used at NewImgeFromImage internally.

func RecordScreenAsGIF

func RecordScreenAsGIF(update func(*ebiten.Image) error, out io.Writer, frameNum int) func(*ebiten.Image) error

RecordScreenAsGIF is deprecated as of version 1.6.0-alpha.

RecordScreenAsGIF returns updating function with recording the screen as an animation GIF image.

This encodes each screen at each frame and may slows the application.

Here is the example to record initial 120 frames of your game:

func update(screen *ebiten.Image) error {
    // ...
}

func main() {
    out, err := os.Create("output.gif")
    if err != nil {
        log.Fatal(err)
    }
    defer out.Close()

    update := RecordScreenAsGIF(update, out, 120)
    if err := ebiten.Run(update, 320, 240, 2, "Your game's title"); err != nil {
        log.Fatal(err)
    }
}

Types

type ReadSeekCloser

type ReadSeekCloser interface {
	io.ReadSeeker
	io.Closer
}

ReadSeekCloser is io.ReadSeeker and io.Closer.

func OpenFile

func OpenFile(path string) (ReadSeekCloser, error)

OpenFile opens a file and returns a stream for its data.

The path parts should be separated with slash '/' on any environments.

Note that this doesn't work on mobiles.